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Finding the Fourth Proportional to 3,990.68, 5,986.22 and 1,491.31

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Solution

The fourth proportional to 3,990.68, 5,986.22 and 1,491.31 is: 2,237.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.68 : 5,986.22 = 1,491.31 : x
  2. Step 2: Convert to fraction form
    3,990.68/5,986.22 = 1,491.31/x
  3. Step 3: Cross multiply
    3,990.68x = 5,986.22 × 1,491.31
  4. Step 4: Simplify right side
    3,990.68x = 8,927,287.33
  5. Step 5: Solve for x
    x = 8,927,287.33/3,990.68
  6. Step 6: Final answer
    x = 2,237.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.